Appendix D: On-Board Video
system memory is installed. DVMT returns system memory back to the operating system when the additional
system memory is no longer required by the graphics subsystem.
DVMT will always use a minimal fixed portion of system physical memory (as set in the BIOS Setup program) for
compatibility with legacy applications. An example of this would be when using VGA graphics under DOS. Once
loaded, the operating system and graphics drivers allocate additional system memory to the graphics buffer as
needed for performing graphics functions.
NOTE
The use of DVMT requires operating system driver support.
Advanced Digital Display (ADD2/ADD2+) Card Support
The GMCH routes two multiplexed DVO ports that are each capable of driving up to a 200 MHz pixel clock to the
PCI Express x16 connector. The DVO ports can be paired for a dual channel configuration to support up to a 400
MHz pixel clock. When an ADD2/ADD2+ card is detected, the Intel GMA950 graphics controller is enabled and the
PCI Express x16 connector is configured for DVO mode. DVO mode enables the DVO ports to be accessed by the
ADD2/ADD2+ card. An ADD2/ADD2+ card can either be configured to support simultaneous display with the
primary VGA display or can be configured to support dual independent display as an extended desktop
configuration with different color depths and resolutions. ADD2/ADD2+ cards can be designed to support the
following configurations:
. TV-Out (composite video)
. Transition Minimized Differential Signaling (TMDS) for DVI 1.0
. Low Voltage Differential Signaling (LVDS)
. Single device operating in dual channel mode
. VGA output
. HDTV output
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Summary of Contents for MicroATX Express
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